Troubleshooting
General Problems 5-13
Classic PLC-5
processors only
☞
Indicator Color Description Probable Cause Recommended Action
PROC
REM I/O
COMM
all red
(steady)
internal diagnostics have
failed
Power down, reseat processor and power up.
Then, clear memory and reload your program.
Replace EEPROM with new program. Then, if
necessary, replace
the processor.
FORCE amber
(steady)
forces enabled normal operation none
amber
(blinking)
forces present, but not
enabled
normal operation none
off no forces present normal operation none
BATT off battery is good normal operation none
red
(steady)
battery low Replace battery within 1-2 days (typical).
ADPT green
(steady)
processor is in adapter
mode
normal operation none
off processor is in scanner
mode
normal operation none
COMM
BATT
FAULT
REM I/O PROC
ACTIVE
RUN
ADPT FORCE
REM
R
U
N
P
R
O
G
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